To give your dog broad-spectrum protection from dangerous pests talk to your veterinarian about prescription Sentinel Spectrum. Each chewable tablet contains a combination of milbemycin oxime and lufenuron that work together to protect your dog from pests and parasites for a full month. The active ingredients stop heartworm larvae from developing while killing adult hookworms, whipworms, tapeworm and roundworms. They also stop flea eggs from hatching so the flea life cycle is broken and your pet is protected from reinfestation. The tablets are beef flavored for no hassle dosing. Want more information on Sentinel Spectrum? Click the More Information tab above.